Use fontconfig on Linux to find appropriate default font.

.travis.yml

@@ -17,11 +17,11 @@ before_install:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then
       sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32 40976EAF437D05B5;
       sudo apt-get update;
-      sudo apt-get install -q -y xorg-dev;
+      sudo apt-get install -q -y xorg-dev libfontconfig1-dev;
     fi
 
 script:
   - cmake . && cmake --build .
   
 notifications:
-  email: false
\ No newline at end of file
+  email: false

CMakeLists.txt

@@ -443,7 +443,7 @@ if (APPLE)
   mark_as_advanced(COCOA_FRAMEWORK OPENGL_FRAMEWORK CARBON_FRAMEWORK COREAUDIO_FRAMEWORK AVFOUNDATION_FRAMEWORK)
   set(PLATFORM_LIBS ${COCOA_FRAMEWORK} ${OPENGL_FRAMEWORK} ${CARBON_FRAMEWORK} ${COREAUDIO_FRAMEWORK} ${AVFOUNDATION_FRAMEWORK})
 elseif (UNIX)
-  set(PLATFORM_LIBS GL)
+  set(PLATFORM_LIBS GL fontconfig)
 elseif (WIN32)
     if (${BONZOMATIC_WINDOWS_FLAVOR} MATCHES "DX11")
         set(PLATFORM_LIBS d3d11 d3dcompiler dxguid DXGI winmm shlwapi)

src/platform_x11/Misc.cpp

@@ -4,7 +4,11 @@
 #include <string.h>
 #include "../Misc.h"
 
+#include <stdlib.h>
 #include <unistd.h>
+#include <limits.h>
+
+#include <fontconfig/fontconfig.h>
 
 void Misc::PlatformStartup()
 {
@@ -16,17 +20,17 @@ void Misc::PlatformShutdown()
 
 void Misc::InitKeymaps()
 {
-	return;
+  return;
 }
 
 void Misc::GetKeymapName(char* sz)
 {
-	strncpy(sz,"<native>",7);
+  strncpy(sz,"<native>",7);
 }
 
 bool Misc::ExecuteCommand( const char * cmd, const char * param )
 {
-	return false;
+  return false;
 }
 
 bool Misc::FileExists(const char * path)
@@ -36,28 +40,54 @@ bool Misc::FileExists(const char * path)
 
 const char * Misc::GetDefaultFontPath()
 {
-  // Linux case
-  // TODO: use fonts.conf(5) or X resources or something like that
-  const char* fontPaths[] =
+  static char ret[PATH_MAX] = { 0 };
+  FcPattern *pat;
+  FcFontSet *fs;
+  FcObjectSet *os;
+  FcChar8 *file = NULL;
+  FcConfig *config;
+  FcBool result;
+  int i;
+
+  const char *familyNames[] =
   {
-    "/usr/share/fonts/TTF/DejaVuSansMono.ttf",
-    "/usr/share/fonts/TTF/FreeMono.ttf",
-    "/usr/share/fonts/TTF/LiberationMono-Regular.ttf",
-    "/usr/share/fonts/TTF/VeraMono.ttf",
-    "/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf",
-    "/usr/share/fonts/truetype/freefont/FreeMono.ttf",
-    "/usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf",
-    "/usr/share/fonts/truetype/msttcorefonts/cour.ttf",
-    "/usr/share/fonts/truetype/ubuntu-font-family/UbuntuMono-R.ttf",
-    "/usr/share/fonts/corefonts/cour.ttf",
+    "DejaVu Sans Mono",
+    "FreeMono",
+    "Liberation Mono",
+    "Bitstream Vera Sans Mono",
+    "Ubuntu Mono",
     NULL
   };
-  for (int i = 0; fontPaths[i]; ++i)
-  {
-    if (FileExists(fontPaths[i]))
-    {
-      return fontPaths[i];
+
+  result = FcInit();
+  config = FcConfigGetCurrent();
+  FcConfigSetRescanInterval(config, 0);
+
+  pat = FcPatternCreate();
+  os = FcObjectSetBuild (FC_FAMILY, FC_FILE, (char *) 0);
+  FcPatternAddInteger(pat, FC_SPACING, FC_MONO);
+  FcPatternAddInteger(pat, FC_WEIGHT, FC_WEIGHT_REGULAR);
+  FcPatternAddInteger(pat, FC_SLANT, FC_SLANT_ROMAN);
+  fs = FcFontList(config, pat, os);
+
+  for (i=0; fs && i < fs->nfont; i++) {
+    FcChar8 *family;
+    FcPattern *font = fs->fonts[i];
+    if (FcPatternGetString(font, FC_FAMILY, 0, &family) == FcResultMatch) {
+      for (int i = 0; familyNames[i] != NULL; i++) {
+        if (strcmp((const char *)family, familyNames[i]) == 0) {
+          if (FcPatternGetString(font, FC_FILE, 0, &file) == FcResultMatch) {
+            strcpy(ret, (const char *)file);
+            goto out;
+          }
+        }
+      }
     }
   }
-  return NULL;
+
+out:
+  FcFontSetDestroy(fs);
+  FcObjectSetDestroy(os);
+  FcPatternDestroy(pat);
+  return ret;
 }